| crater |
a hollow area shaped like the inside of a bowl. The mouth of a volcano is a crater, and the moon has many craters on its surface. |
| crescent |
the shape of the moon when it looks to us like a narrow arc. The moon appears as a crescent in its first and last quarters. [3 definitions] |
| crust |
the outer layer of Earth, another planet, or a moon. [1/5 definitions] |
| Easter |
a Christian holiday to celebrate that Jesus Christ returned to life after he died. Easter is held every spring on the Sunday after the first full moon between March 21 and April 25. |
| eclipse |
the blocking from view of the sun, a moon, or a planet by another heavenly body. In an eclipse of the sun, the sun is hidden from earth's view by the moon passing between the sun and the earth. [1/3 definitions] |
| full moon |
the moon when it is on the side of Earth that is opposite the sun and looks from Earth like a complete circle. [2 definitions] |
| halo |
any circle or band of light that appears around a source of light, such as the sun or moon. [1/2 definitions] |
| heaven |
(usually plural) the sky, including the stars, sun, moon, and planets as seen from the earth. [1/4 definitions] |
| lunar |
of or having to do with the moon. |
| moon |
the earth's natural satellite. It revolves around the earth from west to east in about 28 days. The moon joins the earth in its orbit around the sun. The moon does not give off light. Instead, its shine comes from the light it reflects from the sun. [1/2 definitions] |
| moonbeam |
a ray of light from the moon. |
| moonlight |
the light of the moon. |
| new moon |
the phase of the moon when it cannot be seen because it passes directly between the sun and the earth. |
| observatory |
a building that has equipment for studying the sun, moon, planets, and stars. |
| phase |
one of the stages of the moon or smaller planets as they change their relation to the sun. A phase is shown by how much of the moon's or planet's lighted area can be seen. [1/2 definitions] |
| planetarium |
a device that projects images of the sun, moon, stars, and planets on a ceiling that is shaped like a dome. [1/2 definitions] |
| quarter |
one fourth of the time that it takes the moon to travel around the earth. A quarter lasts for seven days because it takes 28 days for the moon to make one trip around the earth. [1/9 definitions] |
| spaceship |
a vehicle designed to carry people and cargo in outer space, as to the moon or the other planets. |
| tide |
the change in the height of the surface of oceans and other large bodies of water that happens about every twelve hours. Tides are caused by the pull of the moon and sun. [1/3 definitions] |
| wax2 |
to become brighter. The moon waxes when the size of its bright areas increases from a crescent to a full moon. [1/2 definitions] |
| zodiac |
an imaginary belt in the heavens that includes the paths of the sun, moon, and planets as seen from the earth. The zodiac is divided into twelve equal signs or parts. Each part is named for a constellation that appears within the belt. |